Check out www.freeswitch.org. It should already implement most of what your
talking about.
Mike
On May 25, 2011, at 10:21 PM, Владимир Лучко wrote:
> Hello, everybody!
> I want to code SBC, using sofia-sip. Does has the project reference SBC (as,
> for example opensipstack has OpenSBC)?
> Or may be there is some guide? My first try is not successeful. I create two
> nua_t objects, set them NUTAG_URL with ip`s from the different networks. When
> i got message on the first nua, i try to use SIPTAG_SIP (<sip_t* obj>) to
> send it through the other nua.
>
> Something like that:
>
> -----
> /*NUA 1*/
> snprintf (bind_url, sizeof(bind_url),
> "sip:%s:5060;maddr=%s;transport=udp,tcp", IP1, IP1);
> trace_info ("Bind SIP to %s\n", bind_url);
> g_nua1 = nua_create (g_root, sip_callback, NULL, NUTAG_URL (bind_url),
> TAG_NULL ());
> ...
> nua_set_params (g_nua1, NUTAG_AUTOANSWER (0), NUTAG_AUTOACK (0),
> NUTAG_AUTO302 (0),
> NTATAG_PASS_100 (1), TAG_NULL ());
>
> snprintf (bind_url, sizeof(bind_url),
> "sip:%s:5060;maddr=%s;transport=udp,tcp", IP2, IP2);
> trace_info ("Bind SIP to %s\n", bind_url);
> g_nua2 = nua_create (g_root, sip_callback, NULL, NUTAG_URL (bind_url),
> NUTAG_AUTOANSWER (0),
> NUTAG_AUTOACK (0), NUTAG_AUTO302 (0), NTATAG_PASS_100 (1), TAG_NULL ());
> ....
> nua_set_params (g_nua2, NUTAG_AUTOANSWER (0), NUTAG_AUTOACK (0),
> NUTAG_AUTO302 (0),
> NTATAG_PASS_100 (1), TAG_NULL ());
>
>
> static void
> sip_callback (nua_event_t event, int status, char const *phrase, nua_t *
> nua, void * ctx_root,
> nua_handle_t * nh, void * ctx_handle, sip_t const *sip, tagi_t tags[])
> {
> ...
> nua_handle_t * nhn = nua_handle (g_nua2, NULL, TAG_NULL());
> ...
> nua_invite (nhn, SIPTAG_SIP(sip),TAG_NULL());
> }
> -----
>
> Send invite to the nua1 ip and try to resend it into nua2. Got the error on
> nua_invite:
>
> nua_stack.c:527: nua_signal: Assertion `b == bend' failed.
>
> Look into the stack code - does msgopbjtag_dup for duplicate sip tag work
> wrong or is there other reason for that assertion?
>
> Thank you for answer.
>
> --
> Best regards,
> Vladimir O. Luchko
> Novosibirsk, Eltex
> E-mail: vlad.l...@mail.ru
>
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